156221151 has 4 divisors (see below), whose sum is σ = 208294872. Its totient is φ = 104147432.

The previous prime is 156221113. The next prime is 156221159. The reversal of 156221151 is 151122651.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 156221151 - 2¹⁷ = 156090079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156221159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26036856 + ... + 26036861.

It is an arithmetic number, because the mean of its divisors is an integer number (52073718).

Almost surely, 2^156221151 is an apocalyptic number.

156221151 is a deficient number, since it is larger than the sum of its proper divisors (52073721).

156221151 is an equidigital number, since it uses as much as digits as its factorization.

156221151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52073720.

The product of its digits is 600, while the sum is 24.

The square root of 156221151 is about 12498.8459867301. The cubic root of 156221151 is about 538.5755220483.

The spelling of 156221151 in words is "one hundred fifty-six million, two hundred twenty-one thousand, one hundred fifty-one".